Starcraft devs already figured out perfect user interface in 1998.
I saw to many rts games on market dead on arrival, or quickly dead a lot, because of hotkeys. They are absolute necessary for rts game. You may wonder, but majority your actions are actually in key presses, not in mouse clicks and mouse movement. If game doesn’t have hotkeys, not only that it is not fun having to everything click with mouse, but gameplay it way to slow, because noone is fast enough to queue units with mouse and yet macro and micro at the same time, it just leads to crippled gameplay.
Than custom hotkey settings for everything is good idea, for every player to be able to customize hotkeys to their needs. Camera hotkeys, unit building/group. Learn from starcraft 2 about proper user interface, hotkeys etc.
I feel if this game had good mechanics and hotkeys, it would be much more popular and sold out more.
Than ofc. good balance is needed and patches from time to time and devs has to listen to community. Age of empires probably won’t be esports game, but at least it could be more competetive and had 1v1 queue, a lot of people playing rts want challenge, this may actually bring some players to the game. And gameplay has to be fun, if game suck in any way, it is not good. There were many games, with half-baked game design, one would think that in 2019 devs know how to make rts, but not obviously. And performance should be always before graphics. Game should run at least 120fps min on low.